hitunglah keliling lingkaran jika jari-jarinya 21 cm diameternya 25 cm
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K = πd
K = 3,14 × 25
K = 78,5 cm
K = 2πr
K = 2 × 22/7 × 21
K = 2 × 22 × 3
K = 44 × 3
K = 132 cm
Jari-jari → 21 cm
Diameter → 25 cm
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• Keliling (Dengan Jari-jari)
K = 2πr
K = 2 × [tex]\dfrac{22}{7}[/tex] 21
K = 2 × 22 × 3
K = 44 × 3
K = 132 cm
[tex]~[/tex]
• Keliling (Dengan Diameter)
K = πd
K = 3,14 × 25
K = 78,5 cm
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